Fastening device



June 1945. s. A. TINNERMA'N I 2,378,957 7 FASTENING DEVICE Filed Dec. 22, 1945 Patented June 26, 1945' rnsrENnvG mzvrcn George A. Tlnnerman, Cleveland,

to Timierman Products, Inc., Cleve-land, Ohio; a corporation of Ohio lilriglnal application June 29,1942, Serial No. 448,943. Divided and this application resiliently car e-1.;

Another object is to so form the tongues thatv contrary,

ber 22,1943. Serial No. 515,241

(on. ss-sz) This application is a, division of my pending application, Serial No. 448,943, filed June 29, 1942. This invention relates to a fastening device provided by a plate having two integral upturned srcuete lugs inwardly grooved so that the two lugs provide is helical thread'to engage the threorl oi nboit forspluralityolt V fine of the objects of my invention is to carry the arouote threaded lugs in a resilient m i so that they may be swung inwardly and pulled down by the applied Mil; to not not only as a nut therefor, but as a spring lock applying conthiuous tension to thebolt thus forming nut lock. The lugs are thus self-ener retold their resilient action indefinitely, so that the bolt may be removed whenever desired and a bolt supplied subsequently with the same locking notion.

other object of the invention is to provide such iostening device in a in having o. flat base w adopted for permanent attachment to a plate or lugs I arch the tongues or curve them transversef is, with the result that the flexing oi the tongues as the lugs are drown inwo takes place at the root or the tongues, thst is, oi; the junction with their first base. By this moo-no, o comparatively long own is provided supporting the arcuote lug and insuring rmiliency. There is no danger of a.

permanent set at the first application, which.

rt; u tnhe piece it the tongue flexed adjacent the lug. The a ."r m; of the tongues also has the advantoge thet the arcuate lugs are more readily wn fr the aoent metal.

it perticular object of the invention of this divisionol application is to provide o. iostener which 13W? 7 receive a countersink or inwardly prolooting portion of the blots to which it is secured,

so that by ploying n. bolt with e. countersunk head, I y automoticolly flange an attached plate inwardly in a frusto-conicol form to receive support, the tongues inclining from such base and the'threaded lugs.

there will be no danger of their flexing adjacent to the lugs, with the danger of a permanent set when the device has been. applied, but, on the insuring the flexing from aregion con slderably Another object of the invention is to so devise the various parts of the fastener that the lugs may be readily drawn from the tongue portions of the blank and suificient metal will be available for the formation of properly grooved lugswithout requiring undue thickness of the plate.

In carrying out my invention, 1' provide a. flat urcuate lugs are inwardly threaded and thus vform a nut whlle'the spring tongues carrying them serve to self-energize them to cause them distant from-the lugs and thus maintaining the resiliency.

the head of the bolt, leaving the face oi the head flush with that oitlie app ied plate, while the threaded sh is ly grasped by the u'rcuate s. This is else a feature of my inventionand is illustrated in some of the views of the accompanying wine.

In the drag, Fig. l. is a section through my fastener, the fastener being shown as riveted a support plate receiving the bolt through on applied plate; Fig. 2 is a separated view of the partition of Fig. 1 before the bolt has passed into the fastener; Fig. 3 is a plan of the fastener sectioned through the bolt beyond the fastener; Fig. 4 is a perspective of the fastener; Fig. 5 is a cross section of the fastener, as indicated by the line 5li on Fig. 4; Fig. 6 is a cross section of either one of the tongues ofthe fastener, as indlcatedby the lines H onFls. 3.

As shown in Figs. 1 and 2, A indicates a suitable supporting plate and B a, plate adapted to be orcuate lugs upwardlyfrom the end portions'of a v the tongues at oblique angles to the. tongues.

-These- 5 to maintain a constant tension on the bolt. The result is that after the plate is applied to its supattached thereto. My fastener comprises a flat elongated plate l0, shown as having open n s ll through it for the reception of the rivets 20 by which the plate is secured to the supporting plate A.

tween itsside zones I2, I cut a, pair of parallel slits l8. and between these slits I form a central opening l4 extending transversely from one slit to the other. This leaves a pair of opposed tongues l5 port the self-energizing nut is always available to between the slits. The ends of these tongues are receive the bolt and lock lt-and atthe same time bent up in the term of arcuate lugs l6 which exrem'oval'o! the bolt whenever desired and tend slightly toward each other and are internlfl is ready for the application of a subsequent ally threaded by inclined ribs and grooves on each 7 bolt. lug forming in eiIect a. continuous helix l1, part In resilient support oithe arcuate one one log and part on the other.

In the intermediate region of the plate It bei The tongues are arched upwardly transversely I The transverse arching of the tongues restricts the flexing of the tongue to a region at its junction with the plate I. This gives a long arm carrying the threaded lug, insuring resiliency in the action. There is no chance for the tongue to be bent in some intermediate region, which might result in a permanent set of the metal on the first application of the fastener.

My fastener is especially adapted for use with bolts having countersunk heads. To enable this the side zones H of the base plate are formed into dome segments, as shown. These dome segments and the intermediate inclined tongues, when proportioned as shown, make in effect an elliptical dome rising from the vflat body of the plate III. In any case the two dome segments and the upwardly inclined tongues leave a vacant space I8 above the bottom plane of the plat l and above the supporting plate A to which it is shown as secured by rivets 2U.

The supporting plate A is shown as having an opening surrounded by a frusto-conical flange a- 30 helicaHy-threaded on their concave faces.

extending into the opening beneath the dome. This provides for countersinking the applied plate B, about to be described.

,The applied plateB has an opening for the reception of the bolt, which opening is surrounded by a frusto-conical flange b. The screw C having a conical head c is adapted to pass through the openings of the plates Band A into the bolt opening ll (Fig.3) of the fastener and engage the thread I! provided by the lugs l6 of'the fastener., In such position, when the bolt has been turned home, the frusto-conical flange at the plate A occupies the space la beneath the dome segments and beneath the tongues l5, and the frusto-conical flange b of the applied plate B nests within the flange a and the conical head 0 of the screw C snugly engages the conical flange b.

The construction just described enables the outer surface of the screw head to be flush with the surface of the plate B. This is particularly advantageous in airplane or other work where it is desired to streamline the surfaces as much as possible and prevent any external obstruc-- The doming of the fastener provides fortions. this countersinking of the supporting and applied plates and fastening bolt ina very simple and eflicient manner. At the same time this doming stretches metal from the body of the fastener plate into the dome and thus draws metal to the root of the tongues, forcing them toward the cen- 10 terand making more metal available for the formation of the upturned arcuate lugs which carry the screw thread.

I claim:

1. A fastening device comprising a plate, a pair ,15 of dome segments formed from the body of the plate, a pair ofopposed tongues cut from the in-" termediate region of the plate and bent up obliquely and transversely arched, and arcuate lugs upturned from the ends of the, tongues and helically threaded on their adjacent faces.

2. A- fastening device comprising a plate of sheet material, a pair of dome segments pressed upwardly from the body of the plate, a pair of opposed tongues between the inner edges of the segments, said tongues being joined to the body of the plate at their distant ends and being transversely arched in an upward direction and arcuate lugs upturned from the ends of the tongues with their convex faces outwardly, said lugs being 3.'A fastening device comprising an elongated plate; a substantially elliptical dome formed from.

the body of the plate by dome segments and a pair of opposed tongues cut from the body by a passing through the plate, there being a free space beneath such dome.

4. A fastening device comprising a plate having a bolt opening, a pair of dome segments formed from the body of the plate and lyin respectively on opposite sides of said opening, opposed tongues partially severed from the body of the platebetween the dome segments and at- 5 tached to the plate at their distant ends and arcuate lugs upturned from the adjacent ends of the tongues and threaded for a plurality'of turns on their adjacent faces by ribs and grooves forming in effect one continuous helix.

' GEORGE A. TINNERMAN. 

